Inhibition of Respiration in Protoplasts from Meristematic Tissues3

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Abstract
Owen, J. H., Hetherington, A. M. and Wellburn, A. R. 1986. Inhibition of respiration in protoplasts from meristematic tissues by abscisic acid in the presence of calcium ions.—J. exp. Bot. 38:498–505. A study was made of the influences of abscisic acid (ABA) and calcium ions on mitochondrial respiration in protoplasts from cells close to the basal intercalary meristem of light-grown barley (Hordeum vulgare L. cv. Patty) seedlings. This respiration was inhibited by ABA only when calcium ions were present. The calcium channel agonist BAY K8644 caused a significant inhibition of protoplast dark respiration, similar to that observed using ABA and calcium, presumably because it imitated the action of ABA by increasing calcium influx into protoplasts. These results suggest that ABA increases the permeability of the plasmamembrane to calcium and that calcium acts as a second messenger to regulate mitochondrial respiratory activity and thus the very early events associated with plastid and meristematic cell development.

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